/* ***** BEGIN LICENSE BLOCK ***** 
 * Version: RCSL 1.0/RPSL 1.0 
 *  
 * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved. 
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 * The contents of this file, and the files included with this file, are 
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 * Version 1.0 (the "RPSL") available at 
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 * the file under the RealNetworks Community Source License Version 1.0 
 * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl, 
 * in which case the RCSL will apply. You may also obtain the license terms 
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 * applicable to this file, the RCSL.  Please see the applicable RPSL or 
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 * This file is part of the Helix DNA Technology. RealNetworks is the 
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 *  
 * ***** END LICENSE BLOCK ***** */ 

/**************************************************************************************
 * Fixed-point MP3 decoder
 * Jon Recker (jrecker@real.com), Ken Cooke (kenc@real.com)
 * June 2003
 *
 * buffers.c - allocation and freeing of internal MP3 decoder buffers
 *
 * All memory allocation for the codec is done in this file, so if you don't want 
 *  to use other the default system malloc() and free() for heap management this is 
 *  the only file you'll need to change.
 **************************************************************************************/

// J.Sz. 21/04/2006 #include "hlxclib/stdlib.h"		/* for malloc, free */ 


#include "coder.h"

#define static_buffers // KJ - Changes to Static buffers, Can run with dynamic buffers.
#ifdef static_buffers
MP3DecInfo  mp3DecInfo;     //  0x7f0 =  2032 
SubbandInfo sbi;            // 0x2204 =  8708
IMDCTInfo mi;               // 0x1b20 =  6944
HuffmanInfo hi;             // 0x1210 =  4624
DequantInfo di;             //  0x348 =   840
ScaleFactorInfo sfi;        //  0x124 =   292
SideInfo si;                //  0x148 =   328
FrameHeader fh;             //   0x38 =    56
#else
#include "stdlib.h" // J.Sz. 21/04/2006
#endif

/**************************************************************************************
 * Function:    ClearBuffer
 *
 * Description: fill buffer with 0's
 *
 * Inputs:      pointer to buffer
 *              number of bytes to fill with 0
 *
 * Outputs:     cleared buffer
 *
 * Return:      none
 *
 * Notes:       slow, platform-independent equivalent to memset(buf, 0, nBytes)
 **************************************************************************************/
void ClearBuffer(void *buf, int nBytes)
{
	int i;
	unsigned char *cbuf = (unsigned char *)buf;

	for (i = 0; i < nBytes; i++)
		cbuf[i] = 0;

}

/**************************************************************************************
 * Function:    AllocateBuffers
 *
 * Description: allocate all the memory needed for the MP3 decoder
 *
 * Inputs:      none
 *
 * Outputs:     none
 *
 * Return:      pointer to MP3DecInfo structure (initialized with pointers to all 
 *                the internal buffers needed for decoding, all other members of 
 *                MP3DecInfo structure set to 0)
 *
 * Notes:       if one or more mallocs fail, function frees any buffers already
 *                allocated before returning
 *
 *              Changed by Kasper Jepsen to support static buffers as well.
 *
 **************************************************************************************/
MP3DecInfo *AllocateBuffers(void)
{
  MP3DecInfo *mp3DecInfo_pointer;
  #ifdef static_buffers
  mp3DecInfo_pointer = (MP3DecInfo*)&mp3DecInfo;
  ClearBuffer((void*)&mp3DecInfo, sizeof(MP3DecInfo));

  	mp3DecInfo.FrameHeaderPS =     (void*)&fh;
	mp3DecInfo.SideInfoPS =        (void*)&si;
	mp3DecInfo.ScaleFactorInfoPS = (void*)&sfi;
	mp3DecInfo.HuffmanInfoPS =     (void*)&hi;
	mp3DecInfo.DequantInfoPS =     (void*)&di;
	mp3DecInfo.IMDCTInfoPS =       (void*)&mi;
	mp3DecInfo.SubbandInfoPS =     (void*)&sbi;

	/* important to do this - DSP primitives assume a bunch of state variables are 0 on first use */
    ClearBuffer((void*)&fh,  sizeof(FrameHeader));
	ClearBuffer((void*)&si,  sizeof(SideInfo));
	ClearBuffer((void*)&sfi, sizeof(ScaleFactorInfo));
	ClearBuffer((void*)&hi,  sizeof(HuffmanInfo));
	ClearBuffer((void*)&di,  sizeof(DequantInfo));
	ClearBuffer((void*)&mi,  sizeof(IMDCTInfo));
	ClearBuffer((void*)&sbi, sizeof(SubbandInfo));
   // return mp3DecInfo_pointer;

  #else
	FrameHeader *fh;
	SideInfo *si;
	ScaleFactorInfo *sfi;
	HuffmanInfo *hi;
	DequantInfo *di;
	IMDCTInfo *mi;
	SubbandInfo *sbi;

	mp3DecInfo_pointer = (MP3DecInfo *)malloc(sizeof(MP3DecInfo));
	if (!mp3DecInfo_pointer)
		return 0;
	ClearBuffer(mp3DecInfo_pointer, sizeof(MP3DecInfo));
	
	fh =  (FrameHeader *)     malloc(sizeof(FrameHeader));
	si =  (SideInfo *)        malloc(sizeof(SideInfo));
	sfi = (ScaleFactorInfo *) malloc(sizeof(ScaleFactorInfo));
	hi =  (HuffmanInfo *)     malloc(sizeof(HuffmanInfo));
	di =  (DequantInfo *)     malloc(sizeof(DequantInfo));
	mi =  (IMDCTInfo *)       malloc(sizeof(IMDCTInfo));
	sbi = (SubbandInfo *)     malloc(sizeof(SubbandInfo));

	mp3DecInfo_pointer->FrameHeaderPS =     (void *)fh;
	mp3DecInfo_pointer->SideInfoPS =        (void *)si;
	mp3DecInfo_pointer->ScaleFactorInfoPS = (void *)sfi;
	mp3DecInfo_pointer->HuffmanInfoPS =     (void *)hi;
	mp3DecInfo_pointer->DequantInfoPS =     (void *)di;
	mp3DecInfo_pointer->IMDCTInfoPS =       (void *)mi;
	mp3DecInfo_pointer->SubbandInfoPS =     (void *)sbi;

	if (!fh || !si || !sfi || !hi || !di || !mi || !sbi) {
		FreeBuffers(mp3DecInfo_pointer);	/* safe to call - only frees memory that was successfully allocated */
		return 0;
	}

	/* important to do this - DSP primitives assume a bunch of state variables are 0 on first use */
	//Optimized away.. hmm
    ClearBuffer(fh,  sizeof(FrameHeader));
	ClearBuffer(si,  sizeof(SideInfo));
	ClearBuffer(sfi, sizeof(ScaleFactorInfo));
	ClearBuffer(hi,  sizeof(HuffmanInfo));
	ClearBuffer(di,  sizeof(DequantInfo));
	ClearBuffer(mi,  sizeof(IMDCTInfo));
	ClearBuffer(sbi, sizeof(SubbandInfo));

#endif
	return mp3DecInfo_pointer;

}


#ifndef static_buffers
#define SAFE_FREE(x)	{if (x)	free(x);	(x) = 0;}	/* helper macro */
#endif

/**************************************************************************************
 * Function:    FreeBuffers
 *
 * Description: frees all the memory used by the MP3 decoder
 *
 * Inputs:      pointer to initialized MP3DecInfo structure
 *
 * Outputs:     none
 *
 * Return:      none
 *
 * Notes:       safe to call even if some buffers were not allocated (uses SAFE_FREE)
 **************************************************************************************/
void FreeBuffers(MP3DecInfo *mp3DecInfo)
{
#ifndef static_buffers	
    if (!mp3DecInfo)
		return;

	SAFE_FREE(mp3DecInfo->FrameHeaderPS);
	SAFE_FREE(mp3DecInfo->SideInfoPS);
	SAFE_FREE(mp3DecInfo->ScaleFactorInfoPS);
	SAFE_FREE(mp3DecInfo->HuffmanInfoPS);
	SAFE_FREE(mp3DecInfo->DequantInfoPS);
	SAFE_FREE(mp3DecInfo->IMDCTInfoPS);
	SAFE_FREE(mp3DecInfo->SubbandInfoPS);

	SAFE_FREE(mp3DecInfo);
#endif
}